There is a fundamental difference between sitting on the network flooding it (an activity that requires you to actually be connected to the network, although this could of course be a small and difficult to detect device), and sending 256 packets and walking away, content in the knowledge that for the next 24 hours no one will be able to use the network because you own all of the DHCP leases. "This is trivial netsec."

I never said flood, I said DoS. I don't think this is on-topic so I'm not going to go in to detail but you should Google ARP spoofing. These tactics are quite trivial and I'm teaching undergrads to do it next year.

I was, and continue to be, under the impression that this kind of attack is not possible when an access point has node isolation (a very common feature that even my MiFi router supports, despite it often being turned off in home and even office environments), yet the aforementioned protocol-level DHCP DoS I described would work on any device that implemented the DHCP specification. I therefore fail to see how ARP spoofing is relevant. Remember: we are discussing whether it is a fair belief that any reasonable implementation of DHCP would have implemented the spec as stated.